When can developmenal activities become the cause of disasters ?

Disasters are caused also by some human activities. Some activities carried out by human beings are directly responsible for man-made disasters. These are development activities which become the causes of disasters, sometimes. Example :

1. Bhopal gas tragedy.

2. Chernobyl nuclear disaster and wars.

3. Release of CFCs and increase of greenhouse gases.

There are some other activities of human beings that accelerate or intensify disasters indirectly. Landslides and floods are due to deforestation, unscientific land use and construction activities in fragile areas.